Irreversibility of the two-dimensional enstrophy cascade - Laboratoire Jean-Alexandre Dieudonné Accéder directement au contenu
Article Dans Une Revue Physical Review E Année : 2016

Irreversibility of the two-dimensional enstrophy cascade

Résumé

We study the time irreversibility of the direct cascade in two-dimensional turbulence by looking at the time derivative of the square vorticity along Lagrangian trajectories, a quantity called meten-strophy. By means of extensive direct numerical simulations we measure the time irreversibility from the asymmetry of the probability density function of the metenstrophy and we find that it increases with the Reynolds number of the cascade, similarly to what found in three-dimensional turbulence. A detailed analysis of the different contributions to the enstrophy budget reveals a remarkable difference with respect to what is observed for the energy cascade, in particular the role of the statistics of the forcing to determine the degree of irreversibility.
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Dates et versions

hal-01636088 , version 1 (16-11-2017)

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  • HAL Id : hal-01636088 , version 1

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E Piretto, Stefano Musacchio, F. de Lillo, G Boffetta. Irreversibility of the two-dimensional enstrophy cascade. Physical Review E , 2016. ⟨hal-01636088⟩
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